SU140174A1 - CASTING MACHINE, FOR EXAMPLE, DENTAL PROTESTS - Google Patents

Description

Apparatus for casting, for example, dentures of precious metals or steel, containing a base, a frame, guide rods and a shaped cell, are known. In the proposed apparatus, in contrast to the known devices, it is hermetically sealed with a chamber equipped with stubborn spring locks, a safety valve and a piston dispenser with a spray nozzle. Due to this, the loss of metal in casting is eliminated, and precise and dense casting under pressure is ensured. In the drawing, the representation described is an apparatus for casting. LNG is under pressure in a hermetically closed casting chamber /, consisting of upper and lower parts 2 and 3. The lower part of the chamber is fixed on the base 4, and the upper part is pressed to the lower part with side clocks 5 and the upper lock rod 6 The side locks are equipped with stops 7 with snap rings 8, and the upper locking lever 9 to grip the upper part of the chamber with a force of 10 mounted on it 10. On the side eTOpoiiax there are grooves //. On them slide the collecting rod 12 on the frame 13 of the apparatus, fixed on the base 4. A cuvette 14 with a shape 15 is installed inside the casting chamber. In the upper part of the casting chamber there is a piston metering device (not shown) with a spray gun 16 and a safety valve (not shown). Annarath works as follows. In the initial position, the upper part of the chamber with the help of a nylon lock 6. The cuvette 14 e filled with molten metal mold 15 is installed in a part of the casting chamber, then the upper part is clamped to it, secured with spring locks 5 and 6. Thereafter, Inject flammable cells in the amount you need to create pressure in the chamber to provide accurate casting. The metering device is a piston metering device. The exposure to the molten metal of the combustible mixture ignites, the heat released by this increases the temperature of the melt. Simultaneously, the gases formed in the flame burning mixture in a hermetically sealed chamber cause a sharp increase in pressure in it, ensuring that the melt is compacted in form 15. The volume of the chamber is chosen so that the maximum pressure of combustible gas does not damage the apparatus. In addition, for greater safety of operation, a safety valve is provided at the top of the chamber, through which gases are released if the pressure in the chamber during ignition of the combustible mixture exceeds a certain critical limit.

Injection molding, carried out in the proposed apparatus, is distinguished by density, purity and accuracy; it almost does not require processing, which eliminates the loss of metal.

Subject invention

Apparatus for casting, for example, dentures from precious metals or steel.

including a base, a frame, guide rods and a cuvette with a shape, characterized in that, in order to eliminate metal losses during casting and to ensure accurate and tight casting under pressure, a pressure-tight casting chamber equipped with stop locks, safety valve is used and a piston dispenser with a spray nozzle.